|King of Seisyllwg|
|Reign||872 – 909 AD|
|House||House of Dinefwr|
Cadell was the second son of Rhodri the Great of Gwynedd and Angharad, a princess from Seisyllwg. In 872 Angharad's brother Gwgon, King of Seisyllwg, drowned without leaving an heir. Rhodri became steward over the kingdom, and while he was unable to make a legal claim to the throne, he was able to install Cadell as king.
He passed it to his son, Hywel Dda, at his death in 909. Cadell and Hywel together also conquered Dyfed in 904–905, establishing Hywel as the king in that region. After his father's death, Hywel ruled the kingdoms jointly as Deheubarth.
- Lloyd, John Edward (1912). A History of Wales from the Earliest Times to the Edwardian Conquest. Longmans, Green, and Co. p. 325. Retrieved July 7, 2010.
Lloyd history of Wales.
Cadell ap Rhodri
Dinefwr DynastyBorn: 854 Died: 909
Rhodri the Great
| Prince of Seisyllwg
|Merged by Hywel Dda into Deheubarth|
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